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A one component methodology for the fabrication of honeycomb films from biocompatible amphiphilic block copolymer hybrids: a linear-dendritic-linear twist
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0001-7543-5322
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0002-9372-0829
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2013 (English)In: Polymer Chemistry, ISSN 1759-9954, Vol. 4, no 9, 2680-2690 p.Article in journal (Refereed) Published
Abstract [en]

The development of a facile method for the fabrication of breath figure (BF) films from hydrophobic polymers is gaining significant importance for their accessibility as templates in fields ranging from electronics and cell culturing to sensing and catalysis. By introducing polyester-based dendritic linkers, a library of micrometre sized honeycomb structures was successfully fabricated from amphiphilic linear-dendritic-linear hybrids comprising hydrophobic PCL or PLA and hydrophilic PEG blocks. From the array of produced films, the incorporation of a third generation dendritic linker was found to generate well-ordered honeycomb films in the several hundreds of micrometre range. This one component approach minimizes the number of unknown parameters and represents a fully reliable methodology for the fabrication of functional BFs from challenging and biocompatible polymers.

Place, publisher, year, edition, pages
2013. Vol. 4, no 9, 2680-2690 p.
Keyword [en]
Porous Polymer-Films, Water-Assisted Formation, Breath Figures, Morphology Control, Microporous Films, Membranes, Patterns, Adhesion, Growth, Cells
National Category
Polymer Chemistry
URN: urn:nbn:se:kth:diva-119933DOI: 10.1039/C3PY00053BISI: 000316965200007ScopusID: 2-s2.0-84875818911OAI: diva2:612986
Swedish Research Council, 2011-4477 2010-453

QC 20130514

Available from: 2013-03-26 Created: 2013-03-26 Last updated: 2013-05-14Bibliographically approved
In thesis
1. Novel Porous Films from Functional and Biocompatible Linear-Dendritic Hybrids
Open this publication in new window or tab >>Novel Porous Films from Functional and Biocompatible Linear-Dendritic Hybrids
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the last decades, the fabrication of ordered nano- and microporous structures has attracted increasing interest due to their specific properties and multiple possible applications in electronics, as templates or in the biological field. The development of such materials has been favored by the introduction of the simple breath-figure templating method in the 1990’s. In order to fully exploit the potential of these porous materials, the use of advanced functional molecules as precursors is essential. One suitable class of molecules is the well-defined linear-dendritic hybrids (LD hybrids) family. The structural variations, multiple end-groups and possible amphiphilicity of these molecules are significant advantages that could lead to highly sophisticated functional materials with potential usage in biology. Therefore, this project was directed towards the synthesis of advanced LD hybrids and the evaluation of their ability to form ordered functional porous films.

A degradation and toxicity study was initially conducted on polyester-based 2,2-bis(methylol)propionic acid (bis-MPA) dendrimers under physiological conditions to support the potential usage of these molecules for biological purposes. The materials were found to undergo a relatively fast depolymerization process at pH 7.5. Moreover, the initial dendrimer and its decomposition products were proven to be non-toxic for immune competent cells, allowing for the utilization of these molecules for biological applications.

A linear-dendritic-linear hybrid library was successfully synthesized from biocompatible poly(ethylene glycol) (PEG), poly(ε-caprolactone) (PCL) and bis-MPA building blocks using a combination of ring-opening polymerization (ROP)and copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC). The materials, consisting of one long PEG block connected to the focal point of the dendron and several PCL arms attached at its periphery, were used to construct ordered porous films using the breath figure method. The polymeric architecture strongly affected the ordering of the films with a more regular morphology obtained from a more flexible polymer. Changing the semi-crystalline PCL to amorphous polylactide (PLA) also permitted the formation of porous arrays. Interestingly, films obtained from inverted structures possessing one long PCL block and several short PEG chains, also presented a regular morphology. Moreover they could be activated to exhibit multiple surface hydroxyl groups.

To increase the number of orthogonal synthetic methodologies available for the preparation of advanced macromolecules, high molecular weight dendritic macrothiols were synthesized. These molecules were efficiently coupled to a number of core molecules via thiol-ene coupling, generating a comprehensive library of dendritic materials. This approach represents an attractive alternative to the commonly used, but potentially toxic, CuAAC.

Exploiting the obtained results, a final LD hybrid was synthesized from atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate (HEMA) derivatives and thiol-ene coupling (TEC) with macrothiols. This macromolecule was successfully utilized to form functional ordered porous arrays and the availability of peripheral alkyne functional groups was demonstrated by efficient coupling with fluorescent Rhodamine-B. The HEMA-backbone allowed for the introduction of cross-linkable azide groups that were used to significantly improve the thermal stability of the films from 50 °C to 200 °C. These materials have the potential to be used in applications such as catalysis, in medicine and as sensors.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. 62 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2013:15
poly(ethylene glycol), poly(caprolactone), linear-dendritic hybrid; click chemistry, CuAAC, thiol-ene chemistry, amphiphilic polymer, honeycomb film, isoporous film, thiol, dendrimer
National Category
Polymer Technologies
urn:nbn:se:kth:diva-119985 (URN)978-91-7501-691-7 (ISBN)
Public defence
2013-04-19, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Swedish Research Council

QC 20130327

Available from: 2013-03-27 Created: 2013-03-26 Last updated: 2013-03-27Bibliographically approved

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Walter, Marie V.Lundberg, PontusHult, DanielHult, AndersMalkoch, Michael
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